Version: unknown (using 4.4.2 (KDE 4.4.2), Kubuntu packages) Compiler: cc OS: Linux (x86_64) release 2.6.32-21-generic KDE System Settings for multiple display does not report failure if the multiple monitor resultion exceeds the virtual desktop size in xorg.conf. The Size and Orientation tab of System Settings will quietly fail to apply a resolution that exceeds that of the virtual desktop. No error or messages are returned to the user. When executed from the command line, xrandr returns the following message: xrandr: screen cannot be larger than 2560x2560 (desired size 2720 900).
Thanks for reporting your bug. Since reporting Krandr has since been replaced by KScreen. It is available in the Plasma 4 series, and is default in Plasma 5 onwards. I hope this solves your issue. If you still have a problem after upgrading please reopen a new bug under kscreen. Thanks